year's display features 56 trees in all including one for each state, territory and, of course, our town washington d.c. this is the 90th year for the event. organizers are expecting more than 20,000 people for the show. we will bring it to you live right here on wusa9. top, what kind of temperatures are we expecting? not too bad but not balmy like the last couple days? >> no, no 70s but 40s. erica will go out there tomorrow night. dress warmer than you think i told her and i'll tell you. it just seems to be colder there. it's a new tree they got within 50 miles of the nation's capital. the one before it a storm blew over. that was a live tree. it didn't take well. now they have a new one. they think hopefully it will take there. >> so it days there after. >> stays there. >> learn something new. >>> we show you pictures from space all the time, but this is a composite of the dark side of the earth. you can see all the light from the populated areas. this is from nasa. it's going to help us study some of the human activities on the earth we don't understand so well and even some weather activities w